If you mean that an item you've listed is no longer available, because it's been stolen, just end the listing. It's simple enough - click on More Actions beside the listing on your Selling page.
If that isn't what you mean, please provide some clear information.
Everything you need to know about selling on Ebay, including how to manage your listings and account, is in the Seller Centre. You also have the Help pages with their integral search to refer to.
@slhibbs
